Thanks for that. Two sets are now on my Summit Wishlist.you can also buy header bolts with 5/16 head, This is what I use
ARP 100-1110 5/16 Inch Head Header Bolts (speedwaymotors.com)
SK has you covered. They sell a comprehensive set of just 10mm sockets.You have actually one of those?
...and you know where it is, too?
Wow.
One day a mechanic is going to remove a fender & it’s going to dump out 10mm sockets like a sack of rice.
https://sktools.com/shop/15-piece-10mm-socket-set.html